/* ctype.h: Character handling functions. */ #ifndef _CTYPE_H #define _CTYPE_H #ifdef __cplusplus extern "C" { #endif int isalnum(int c); int isalpha(int c); int isascii(int c); int iscntrl(int c); int isdigit(int c); int isxdigit(int c); int isspace(int c); int ispunct(int c); int isprint(int c); int isgraph(int c); int islower(int c); int isupper(int c); int isblank(int c); int tolower(int c); int toupper(int c); #ifdef __cplusplus } #endif #endif